20492 has 12 divisors (see below), whose sum is σ = 36960. Its totient is φ = 9936.

The previous prime is 20483. The next prime is 20507. The reversal of 20492 is 29402.

It is a self number, because there is not a number n which added to its sum of digits gives 20492.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134 + ... + 242.

It is an arithmetic number, because the mean of its divisors is an integer number (3080).

2²⁰⁴⁹² is an apocalyptic number.

It is an amenable number.

20492 is a deficient number, since it is larger than the sum of its proper divisors (16468).

20492 is a wasteful number, since it uses less digits than its factorization.

20492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 20492 is about 143.1502706948. The cubic root of 20492 is about 27.3649577783.

Adding to 20492 its reverse (29402), we get a palindrome (49894).

It can be divided in two parts, 20 and 492, that added together give a 9-th power (512 = 2⁹).

The spelling of 20492 in words is "twenty thousand, four hundred ninety-two".